package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Service
public class DishServiceImp implements DishService {

    @Autowired
    DishFlavorMapper dishFlavorMapper;
    @Autowired
    DishMapper dishMapper;
    @Autowired
    CategoryMapper categoryMapper;
    @Autowired
    SetmealDishMapper setmealDishMapper;
    /**
     * 通过Id查询菜品
     * @return
     */
    @Override
    public DishVO getDishById(Long DishId) {
        DishVO dishVO=new DishVO();
        List<DishFlavor> dishFlavor= dishFlavorMapper.getByDishId(DishId);
        dishVO.setFlavors(dishFlavor);
        Dish dish=dishMapper.getById(DishId);

        dishVO.setCategoryName(categoryMapper.getName(dish.getCategoryId()));
        // 2. 复制相同字段
        BeanUtils.copyProperties(dish,dishVO);

        return dishVO;
    }

    @Override
    public List<Dish> getDishByCategoryId(Long CategoryId) {
        List<Dish> dishes=dishMapper.getByCategoryId(CategoryId);
        return dishes;
    }


    @Override
    @Transactional//注解方式的启动管理
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.insert(dish);
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors!=null&& !flavors.isEmpty()){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {


        // 这行代码是关键：告诉 PageHelper 接下来的查询需要分页
        PageHelper.startPage(
                dishPageQueryDTO.getPage(),// 页码（从1开始）
                dishPageQueryDTO.getPageSize() // 每页条数
        );
        Page<DishVO> page= dishMapper.pageQuery(dishPageQueryDTO);
        // 从 Page 对象中提取总条数和当前页数据，封装成 PageResult
        PageResult pageResult = new PageResult();
        pageResult.setTotal(page.getTotal());  // 总记录数
        pageResult.setRecords(page.getResult());  // 当前页的数据列表
        return pageResult;
    }

    @Override
    public void stopOrBegin(int status, long id) {
        Dish dish = new Dish();
        dish.setStatus(status);
        dish.setId(id);
        dishMapper.changeDish(dish);
    }



    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        //删除菜品表原数据
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.changeDish(dish);

        //Todo
        //删除原本口味数据

        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> dishFlavors=dishDTO.getFlavors();
        if(dishFlavors!=null&&dishFlavors.size()>0){
            dishFlavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
        }
        dishFlavorMapper.insertBatch(dishFlavors);
    }

    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除，是否存在起售中的菜品？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否被套餐关联？关联了也不能删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }


//        for (Long id : ids) {
//            //删除菜品表的菜品数据
//            dishMapper.deleteByID(id);
//            //删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }
        dishMapper.deleteByIDs(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.getByCategoryIdAndStatus(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
